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#1
July 7th 15, 01:25 PM
posted to rec.radio.amateur.antenna
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An antenna question--43 ft vertical
On 7/7/2015 6:25 AM, Ian Jackson wrote:
In message , Jerry Stuckle writes Sure, there is ALWAYS VSWR. It may be 1:1, but it's always there. If there's no reflection, there can be no standing wave. So, being pedantic, there's no such thing as an SWR of 1:1! Why do you say that? If there is no reflection the voltage on the line is purely due to the forward signal and so the VSWR is 1:1. What's wrong with that? -- Rick |
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#2
July 7th 15, 02:10 PM
posted to rec.radio.amateur.antenna
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An antenna question--43 ft vertical
rickman wrote:
On 7/7/2015 6:25 AM, Ian Jackson wrote: In message , Jerry Stuckle writes Sure, there is ALWAYS VSWR. It may be 1:1, but it's always there. If there's no reflection, there can be no standing wave. So, being pedantic, there's no such thing as an SWR of 1:1! Why do you say that? If there is no reflection the voltage on the line is purely due to the forward signal and so the VSWR is 1:1. What's wrong with that? You are, of course, right. I suspect that VSWR was defined to give technicians a nice easy number to aim for, rather than infinite return loss, to indicate no reflections. -- Roger Hayter |
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#3
July 7th 15, 04:09 PM
posted to rec.radio.amateur.antenna
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An antenna question--43 ft vertical
In message , rickman
writes On 7/7/2015 6:25 AM, Ian Jackson wrote: In message , Jerry Stuckle writes Sure, there is ALWAYS VSWR. It may be 1:1, but it's always there. If there's no reflection, there can be no standing wave. So, being pedantic, there's no such thing as an SWR of 1:1! Why do you say that? If there is no reflection the voltage on the line is purely due to the forward signal and so the VSWR is 1:1. What's wrong with that? A standing wave is caused by a reflection. If there IS no reflection, there is NO standing wave. So while you can have an SWR of 1.00000000000001-to-1 (because a standing wave DOES exist), you can't really have one of 1-to-1 (because there IS no standing wave). ;o)) [Just a bit of pedantic, lateral thinking on my part. Don't worry too much about it. It has absolutely no bearing whatsoever on the current discussions.] -- Ian |
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#4
July 7th 15, 06:41 PM
posted to rec.radio.amateur.antenna
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An antenna question--43 ft vertical
Ian Jackson wrote:
In message , rickman writes On 7/7/2015 6:25 AM, Ian Jackson wrote: In message , Jerry Stuckle writes Sure, there is ALWAYS VSWR. It may be 1:1, but it's always there. If there's no reflection, there can be no standing wave. So, being pedantic, there's no such thing as an SWR of 1:1! Why do you say that? If there is no reflection the voltage on the line is purely due to the forward signal and so the VSWR is 1:1. What's wrong with that? A standing wave is caused by a reflection. If there IS no reflection, there is NO standing wave. So while you can have an SWR of 1.00000000000001-to-1 (because a standing wave DOES exist), you can't really have one of 1-to-1 (because there IS no standing wave). ;o)) [Just a bit of pedantic, lateral thinking on my part. Don't worry too much about it. It has absolutely no bearing whatsoever on the current discussions.] Quite so: a voltage standing wave *ratio* of 1 means no standing wave. But in the name of the unit the "standing wave" is adjectival, and it is still a valid name even when there is no standing wave. And, anyway, you can still colloquially have a resistance of zero ohms even for a superconductor! -- Roger Hayter |
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#5
July 7th 15, 09:35 PM
posted to rec.radio.amateur.antenna
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An antenna question--43 ft vertical
On 7/7/2015 11:09 AM, Ian Jackson wrote:
In message , rickman writes On 7/7/2015 6:25 AM, Ian Jackson wrote: In message , Jerry Stuckle writes Sure, there is ALWAYS VSWR. It may be 1:1, but it's always there. If there's no reflection, there can be no standing wave. So, being pedantic, there's no such thing as an SWR of 1:1! Why do you say that? If there is no reflection the voltage on the line is purely due to the forward signal and so the VSWR is 1:1. What's wrong with that? A standing wave is caused by a reflection. If there IS no reflection, there is NO standing wave. So while you can have an SWR of 1.00000000000001-to-1 (because a standing wave DOES exist), you can't really have one of 1-to-1 (because there IS no standing wave). ;o)) [Just a bit of pedantic, lateral thinking on my part. Don't worry too much about it. It has absolutely no bearing whatsoever on the current discussions.] Sounds great, but that is not how the VSWR is defined.  -- Rick |
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